CN109239528A - Based on morphologic overhead transmission line high impedance fault analysis method and system - Google Patents
Based on morphologic overhead transmission line high impedance fault analysis method and system Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention discloses one kind to be based on morphologic overhead transmission line high impedance fault analysis method and system, initial current traveling wave (Initial Current Traveling Waves is handled using a kind of Novel Filter based on mathematical morphology, ICTWs transient signal) is to extract effective feature volume therein, the time for measuring initial current traveling wave arrival transmission line of electricity both ends relay and polarity are for accident analysis, to quickly determine its fault zone, fault type and failure phase, accuracy and reliability with higher.
Description
Technical field
The present invention relates to power fault analysis technologies, more particularly to one kind to be based on morphologic overhead transmission line high impedance
Failure analysis methods and system.
Background technique
It is most of all to use place of the small wave converting method as transient signal in the failure analysis methods based on traveling wave method
Science and engineering tool, the process is computationally intensive, and is influenced in high impedance fault by noise jamming, and accident analysis effect is also therewith
Decline.And high impedance fault analysis is an important kind of accident analysis, the identification of fault zone, type and failure phase is
The important prerequisite that relay protection, fault oscillograph and automatic sub-synchronous device correctly act, and it is steady improving electrical power system transient
It plays an important role in terms of qualitative and transmission line of electricity power delivery capabilities, for the above feature, it is accordingly required in particular to defeated for making somebody a mere figurehead
The high impedance fault of electric line carries out quickly analysis comprehensively.
Summary of the invention
Present invention is primarily aimed at provide a kind of based on morphologic overhead transmission line high impedance fault analysis method
And system, to realize that the high impedance fault to overhead transmission line carries out quickly analysis comprehensively.
The present invention is achieved through the following technical solutions:
One kind being based on morphologic overhead transmission line high impedance fault analysis method, comprising:
Step 1: the initial current traveling wave that detection transmission line of electricity is generated because high impedance fault occurs passes through morphologic filtering
Device handles the transient signal in the initial current traveling wave to obtain its effective feature volume, and determines therefrom that the initial current row
Wave reaches time and the polarity of the relay at the transmission line of electricity both ends；
Step 2: reaching time and the polarity of transmission line of electricity both ends relay according to the initial current traveling wave, determine
Fault zone, fault type and the failure phase of the transmission line of electricity.
Further, the Morphologic filters determine the initial current row according to the variation slope of the transient signal
The polarity of wave, when the variation slope of the transient signal is timing, expanding signal is ahead of it and corrodes signal, when the transient state
When the variation slope of signal is negative, expanding signal lags behind it and corrodes signal, swollen when the transient signal does not change
Subframe signal corrodes signal same-phase with it.
Further, the initial current travelling wave signal that the relay at the transmission line of electricity both ends receives is converted by phase mould
Obtain each modal components, in the step 2 by the analysis to each modal components determine the transmission line of electricity fault type and
Failure phase.
Further, each modal components include MA0、MAα、MAβ、MAγAnd MB0、MBα、MBβ、MBγ, wherein MA0Indicate it
In initial current traveling wave is converted to through phase mould in a relay 0 mold component, MAα、MAβ、MAγFor corresponding Aerial mode component, MB0
For 0 mold component that initial current traveling wave in another relay is converted to through phase mould, MBα、MBβ、MBγFor corresponding Aerial mode component,
If ia,、ib、icThe initial current signal of A, B, C three-phase of the respectively described transmission line of electricity, the impedance ground of the transmission line of electricity
For 0 Ω, then matrix expression are as follows:
The boundary condition of generation A phase short circuit grounding failure is on the transmission line of electricityvaFor the initial electricity of A phase
Signal is pressed, then works as satisfactionWhen, determine that A phase short circuit grounding failure occurs on the transmission line of electricity；
The boundary condition of generation AB two-phase short-circuit fault is on the transmission line of electricityThen work as satisfactionWhen, determine that AB two-phase short-circuit fault occurs on the transmission line of electricity；
The boundary condition of generation ABG line to line fault ground fault is on the transmission line of electricityThen work as satisfactionWhen, determine that ABG line to line fault ground fault occurs on the transmission line of electricity.
Further, if reaching in the initial current traveling wave of the relay at the transmission line of electricity both ends, preceding travelling wave current and
Anti- travelling wave current exists, then determines that the failure occurs in the protection line segment region between two relays, otherwise, it is determined that institute
Failure is stated to occur except the region.
One kind being based on morphologic overhead transmission line high impedance fault analysis system, comprising:
Initial current travelling wave analysis module, the initial current generated for detecting transmission line of electricity because high impedance fault occurs
Traveling wave handles the transient signal in the initial current traveling wave by Morphologic filters to obtain its effective feature volume, and according to
This determines that the initial current traveling wave reaches time and the polarity of the relay at the transmission line of electricity both ends；
Fault determination module, for reaching the time of transmission line of electricity both ends relay according to the initial current traveling wave
And polarity, determine fault zone, fault type and the failure phase of the transmission line of electricity.
Further, the Morphologic filters determine the initial current row according to the variation slope of the transient signal
The polarity of wave, when the variation slope of the transient signal is timing, expanding signal is ahead of it and corrodes signal, when the transient state
When the variation slope of signal is negative, expanding signal lags behind it and corrodes signal, swollen when the transient signal does not change
Subframe signal corrodes signal same-phase with it.
Further, the initial current travelling wave signal that the relay at the transmission line of electricity both ends receives is converted by phase mould
Each modal components are obtained, determine the failure of the transmission line of electricity in the fault determination module by the analysis to each modal components
Type and failure phase.
Further, each modal components include MA0、MAα、MAβ、MAγAnd MB0、MBα、MBβ、MBγ, wherein MA0Indicate it
In initial current traveling wave is converted to through phase mould in a relay 0 mold component, MAα、MAβ、MAγFor corresponding Aerial mode component, MB0
For 0 mold component that initial current traveling wave in another relay is converted to through phase mould, MBα、MBβ、MBγFor corresponding Aerial mode component,
If ia,、ib、icThe initial current signal of A, B, C three-phase of the respectively described transmission line of electricity, the impedance ground of the transmission line of electricity
For 0 Ω, then matrix expression are as follows:
The boundary condition of generation A phase short circuit grounding failure is on the transmission line of electricityvaFor the initial electricity of A phase
Signal is pressed, then works as satisfactionWhen, determine that A phase short circuit grounding failure occurs on the transmission line of electricity；
The boundary condition of generation AB two-phase short-circuit fault is on the transmission line of electricityThen work as satisfactionWhen, determine that AB two-phase short-circuit fault occurs on the transmission line of electricity；
The boundary condition of generation ABG line to line fault ground fault is on the transmission line of electricityThen work as satisfactionWhen, determine that ABG line to line fault ground fault occurs on the transmission line of electricity.
Further, if reaching in the initial current traveling wave of the relay at the transmission line of electricity both ends, preceding travelling wave current and
Anti- travelling wave current exists, then the fault determination module determines that the protection line segment area between two relays occurs for the failure
In domain, otherwise, the fault determination module determines that the failure occurs except the region.
Compared with prior art, provided by the invention to be based on morphologic overhead transmission line high impedance fault analysis method
And system, initial current traveling wave (Initial Current is handled using a kind of Novel Filter based on mathematical morphology
Traveling Waves, ICTWs) transient signal to extract effective feature volume therein, measure initial current traveling wave reach it is defeated
The time of electric line both ends relay and polarity are used for accident analysis, to quickly determine its fault zone, fault type and event
Hinder phase, accuracy and reliability with higher.
Detailed description of the invention
Fig. 1 is the stream provided in an embodiment of the present invention based on morphologic overhead transmission line high impedance fault analysis method
Journey schematic diagram；
Fig. 2 is line to line fault ground fault identification process schematic diagram；
Fig. 3 is the group provided in an embodiment of the present invention based on morphologic overhead transmission line high impedance fault analysis system
At schematic diagram.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail.
As shown in Figure 1, provided in an embodiment of the present invention be based on morphologic overhead transmission line high impedance fault analysis side
Method includes:
Step 1: the initial current traveling wave that detection transmission line of electricity is generated because high impedance fault occurs passes through morphologic filtering
Device handles the transient signal in initial current traveling wave to obtain its effective feature volume, and it is defeated to determine therefrom that initial current traveling wave reaches
The time of the relay at electric line both ends and polarity；
Step 2: reaching time and the polarity of transmission line of electricity both ends relay according to initial current traveling wave, determine transmission line of electricity
Fault zone, fault type and failure phase.
The step of failure analysis methods of the present embodiment, is described in detail below.The failure analysis methods of the present embodiment
Based on following principle.
Morphologic filters:
There are two kinds of most basic operations in mathematical morphology: expansion and corrosion are based on both operations, obtain other two
Kind hybrid operation: opening operation and closed operation.If f (n) is signal to be processed, structural element is g (n), and codomain is respectively Df=0,
1,2, K, N-1 } and Dg={ 0,1,2, K, M-1 }, then signal f (n) carries out expansion by structural element g (n) and erosion operation is distinguished
It is expressed asWithIt is defined as follows:
Opening operation and closed operation are expressed asAnd fg, it is defined as follows:
Wherein n ∈ Df, m ∈ Dg
Opening operation can eliminate sharp place and the isolated point at positive pulse signal edge, achieve the effect that smooth signal；And it closes
Operation can then fill crack and slight gap in undersuing, have the function of trap signal.
Morphology mean value edge filter principle:
Conventional filter can detect the variation of signal, but cannot detect its polarity, and since signal is by expanding
There are phase differences with after erosion operation, generate " bias phenomenon ", therefore set forth herein mean value morphological edge filter F (n), mean values
Morphological edge filter can effectively eliminate " bias phenomenon ", detect signal intensity and can detect its polarity, principle is as follows:
Morphology median filter MMF can on the basis of protecting signal edge accurate change in detection signal and superior performance,
Effect is more preferably denoised in order to realize, MMF filter results are subjected to expansion and erosion operation and is averaged, repeatedly,
Expression formula is as follows:
As m=1:
F1(n)=NMMF1(n)=MMF (n)=(fd(n)+fe(n))/2 (6)
Wherein m >=1 is the number for being expanded and being corroded, although m is bigger, noise in the signal that is obtained through filter process
Content is fewer, but efficiency declines as filtering time increases, therefore according to experiment acquired results, m=4 is chosen herein.
When breaking down in transmission line of electricity, Morphologic filters determine initial current row according to the variation slope of transient signal
The polarity of wave, when the variation slope of transient signal is timing, expanding signal is ahead of it and corrodes signal, when the change of transient signal
When change slope is negative, expanding signal lags behind its and corrodes signal, when transient signal does not change, expanding signal and its corruption
Lose signal same-phase.Morphology mean filter according to the present invention exactly utilizes this phenomenon detection signal polarity, principle
Expression formula is as follows:
As d (f (t))/dt > 0, have:
F (output)=F5(d)(n)-F5(e)(n) (7)
As d (f (t))/dt < 0, have
F (output)=F5(e)(n)-F5(d)(n) (8)
Wherein, as m=4, then have:
The output result of F filter only has '+1 ', and ' -1 ' and 0, it can quickly and accurately detect the variation and polarity of signal.
Fault zone, fault type, failure phase distinguishing rule:
When high impedance fault occurs for route, a large amount of initial current traveling waves are produced immediately, pass through split-phase relay RA、RB
The arrival time of middle failure initial current traveling wave and polarity can determine the fault zone, fault type and failure phase simultaneously, and
Obtain corresponding criterion.
In order to eliminate each alternate coupling effect, the present embodiment converts (karenbauer using card human relations Bauer is improved
Transform) by relay RA、RBMiddle initial current signal carries out the conversion of phase mould, and obtaining each modal components includes MA0、MAα、MAβ、
MAγAnd MB0、MBα、MBβ、MBγ, wherein MA0Indicate 0 mould that initial current traveling wave is converted to through phase mould in one of relay
Component, MAα、MAβ、MAγFor corresponding Aerial mode component, MB00 be converted to for initial current traveling wave in another relay through phase mould
Mold component, MBα、MBβ、MBγFor corresponding Aerial mode component.Matrix expression is as follows:
Wherein ia,、ib、icThe respectively initial current signal of A, B, C three-phase of transmission line of electricity, M0For zero _exit, Mα, Mβ
And MγFor Aerial mode component.
Since the determination of fault type and failure phase is obtained by analyzing the relationship between each modal components, it will
Relay (the relay R at transmission line of electricity both endsA、RB) the initial current travelling wave signal that receives is converted to each mould by phase mould
State component, and the fault type and failure phase of transmission line of electricity are determined by the analysis to each modal components in step 2.
Single phase grounding fault:
When occurring ground fault on transmission line of electricity, by taking A phase short circuit grounding failure as an example, it is assumed that impedance ground is 0 Ω, defeated
The boundary condition of A phase short circuit grounding failure occurs in electric line are as follows:
Wherein ibAnd icThe initial current signal of respectively B, C two-phase, vaFor the initial voltage signal of A phase, initial current letter
Number mulch component M0It is not zero, joint type (9) and (10) obtain the criterion of A phase short circuit grounding failure are as follows:
When meeting formula (11), i.e., when being zero when γ modal components, α, β modal components are identical with the polarity of mulch component
When, determine that A phase short circuit grounding failure occurs on transmission line of electricity.
If reaching relay RAAnd RBIn initial current traveling wave in, preceding travelling wave current and anti-travelling wave current exist, then should
Failure occurs in the protection region line segment AB, and the modal components polarity of initial current traveling wave is consistent, that is, has:
P(MAα)·P(MAβ)·P(MA0)=P (MBα)·P(MBβ)·P(MB0) (12)
If reaching relay RAAnd RBIn initial current traveling wave in, preceding travelling wave current and rear travelling wave current do not exist simultaneously,
Then the failure occurs outside the protection region line segment AB, and the modal components polarity of initial current traveling wave is inconsistent, that is, has:
P(MAα)·P(MAβ)·P(MA0)≠P(MBα)·P(MBβ)·P(MB0) (13)
Two-phase short-circuit fault:
For two-phase short-circuit fault type, by taking AB two-phase short-circuit fault as an example, it is assumed that impedance ground is 0 Ω, then power transmission line
The boundary condition of AB two-phase short-circuit fault occurs for road are as follows:
Wherein ia, ibAnd icFormula (9) and (14) simultaneous it is short to be obtained AB two-phase by respectively A, B, C three-phase initial current signal
The discrimination standard of road failure are as follows:
When meeting formula (15), i.e., when 0 modal components are zero, α, β modal components polarity are consistent, and with γ modal components
When polarity is opposite, determine that AB two-phase short-circuit fault occurs on transmission line of electricity.
If reaching relay RAAnd RBIn initial current traveling wave in, preceding travelling wave current and anti-travelling wave current exist, then should
Failure occurs in the protection region line segment AB, and the modal components polarity of initial current traveling wave is consistent, that is, has:
P(MAα)·P(MAβ)·P(MAγ)=P (MBα)·P(MBβ)·P(MBγ) (16)
If reaching relay RAAnd RBIn initial current traveling wave in, preceding travelling wave current and rear travelling wave current do not exist simultaneously,
Then the failure occurs outside the protection region line segment AB, and the modal components polarity of initial current traveling wave is inconsistent, that is, has:
P(MAα)·P(MAβ)·P(MAγ)≠P(MBα)·P(MBβ)·P(MBγ) (17)
Line to line fault ground fault:
The identification process of line to line fault ground fault can refer to Fig. 2.For line to line fault earth fault type, with ABG two
For phase short circuit grounding failure, it is assumed that impedance ground is 0 Ω, and the boundary of ABG line to line fault ground fault occurs on transmission line of electricity
Condition are as follows:
Wherein vaAnd vbThe initial voltage signal of respectively A, B two-phase, joint type (9) and (18) obtain AB line to line fault ground connection
The discrimination standard of failure are as follows:
When meeting above formula (19), determine that ABG line to line fault ground fault occurs on transmission line of electricity.
If reaching relay RAAnd RBIn initial current traveling wave in, preceding travelling wave current and anti-travelling wave current exist, then should
Failure occurs in the protection region line segment AB, and the modal components polarity of initial current traveling wave is consistent, that is, has:
If reaching relay RAAnd RBIn initial current traveling wave in, preceding travelling wave current and rear travelling wave current do not exist simultaneously,
Then the failure occurs outside the protection region line segment AB, and the modal components polarity of initial current traveling wave is inconsistent, that is, has:
Judge that the method for the fault zone on transmission line of electricity can be summarized as, if reaching the first of the relay at transmission line of electricity both ends
In beginning current traveling wave, preceding travelling wave current and anti-travelling wave current exist, then fault determination module determines that failure occurs in two relays
In protection line segment region between device, otherwise, fault determination module determines that failure occurs except region.
Based on above-mentioned failure analysis methods, as shown in figure 3, another embodiment of the present invention additionally provides a kind of be based on based on shape
The overhead transmission line high impedance fault analysis system of state.The system includes:
Initial current travelling wave analysis module 1, the initial electricity generated for detecting transmission line of electricity because high impedance fault occurs
Popular wave handles the transient signal in initial current traveling wave by Morphologic filters to obtain its effective feature volume, and accordingly
Determine that initial current traveling wave reaches time and the polarity of the relay at transmission line of electricity both ends；
Fault determination module 2, for reaching time and the polarity of transmission line of electricity both ends relay according to initial current traveling wave,
Determine fault zone, fault type and the failure phase of transmission line of electricity.
Morphologic filters determine the polarity of initial current traveling wave according to the variation slope of transient signal, when transient signal
Variation slope is timing, and expanding signal is ahead of it and corrodes signal, when the variation slope of transient signal is negative, expansion letter
It number lags behind its and corrodes signal, when transient signal does not change, expanding signal corrodes signal same-phase with it.
The initial current travelling wave signal that the relay at transmission line of electricity both ends receives is converted to each mode point by phase mould
It measures, passes through the fault type and failure phase for determining transmission line of electricity to the analysis of each modal components in fault determination module 2.
Each modal components include MA0、MAα、MAβ、MAγAnd MB0、MBα、MBβ、MBγ, wherein MA0Indicate one of relay
0 mold component that middle initial current traveling wave is converted to through phase mould, MAα、MAβ、MAγFor corresponding Aerial mode component, MB0For another relay
0 mold component that initial current traveling wave is converted to through phase mould in device, MBα、MBβ、MBγFor corresponding Aerial mode component, if ia,、ib、icPoint
Not Wei transmission line of electricity A, B, C three-phase initial current signal, the impedance ground of transmission line of electricity is 0 Ω, then matrix expression are as follows:
The boundary condition of generation A phase short circuit grounding failure is on transmission line of electricityvaBelieve for the initial voltage of A phase
Number, then work as satisfactionWhen, determine that A phase short circuit grounding failure occurs on transmission line of electricity；
The boundary condition of generation AB two-phase short-circuit fault is on transmission line of electricityThen work as satisfactionWhen, determine that AB two-phase short-circuit fault occurs on transmission line of electricity；
The boundary condition of generation ABG line to line fault ground fault is on transmission line of electricityThen work as satisfactionWhen, determine that ABG line to line fault ground fault occurs on transmission line of electricity.
If preceding travelling wave current and anti-travelling wave current are deposited in the initial current traveling wave for reaching the relay at transmission line of electricity both ends
Then fault determination module 2 determines that failure occurs in protection line segment region between two relays, and otherwise, failure determines mould
Block 2 determines that failure occurs except region.
The trouble analysis system is corresponding with above-mentioned failure analysis methods, for executing above-mentioned failure analysis methods, specifically
Working principle can refer to the explanation in above-mentioned failure analysis methods, and details are not described herein.
Above-described embodiment is only preferred embodiment, the protection scope being not intended to limit the invention, in spirit of the invention
With any modifications, equivalent replacements, and improvements made within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. one kind is based on morphologic overhead transmission line high impedance fault analysis method characterized by comprising
Step 1: the initial current traveling wave that detection transmission line of electricity is generated because high impedance fault occurs, at Morphologic filters
The transient signal in the initial current traveling wave is managed to obtain its effective feature volume, and determines therefrom that the initial current traveling wave arrives
Time and polarity up to the relay at the transmission line of electricity both ends；
Step 2: reach time and the polarity of transmission line of electricity both ends relay according to the initial current traveling wave, determine described in
Fault zone, fault type and the failure phase of transmission line of electricity.
2. being based on morphologic overhead transmission line high impedance fault analysis method as described in claim 1, which is characterized in that
The Morphologic filters determine the polarity of the initial current traveling wave according to the variation slope of the transient signal, when described temporary
The variation slope of state signal is timing, and expanding signal is ahead of it and corrodes signal, when the variation slope of the transient signal is
When negative, expanding signal lags behind it and corrodes signal, and when the transient signal does not change, expanding signal corrodes letter with it
Number same-phase.
3. being based on morphologic overhead transmission line high impedance fault analysis method as described in claim 1, which is characterized in that
The initial current travelling wave signal that the relay at the transmission line of electricity both ends receives is converted to each modal components, institute by phase mould
State the fault type and failure phase for determining the transmission line of electricity in step 2 by the analysis to each modal components.
4. being based on morphologic overhead transmission line high impedance fault analysis method as claimed in claim 3, which is characterized in that
Each modal components include MA0、MAα、MAβ、MAγAnd MB0、MBα、MBβ、MBγ, wherein MA0It indicates in one of relay just
0 mold component that beginning current traveling wave is converted to through phase mould, MAα、MAβ、MAγFor corresponding Aerial mode component, MB0For in another relay
0 mold component that initial current traveling wave is converted to through phase mould, MBα、MBβ、MBγFor corresponding Aerial mode component, if ia,、ib、icRespectively
The initial current signal of A, B, C three-phase of the transmission line of electricity, the impedance ground of the transmission line of electricity are 0 Ω, then expression matrix
Formula are as follows:
The boundary condition of generation A phase short circuit grounding failure is on the transmission line of electricityvaBelieve for the initial voltage of A phase
Number, then work as satisfactionWhen, determine that A phase short circuit grounding failure occurs on the transmission line of electricity；
The boundary condition of generation AB two-phase short-circuit fault is on the transmission line of electricityThen work as satisfactionWhen, determine that AB two-phase short-circuit fault occurs on the transmission line of electricity；
The boundary condition of generation ABG line to line fault ground fault is on the transmission line of electricityThen work as satisfactionWhen, determine that ABG line to line fault ground fault occurs on the transmission line of electricity.
5. being based on morphologic overhead transmission line high impedance fault analysis method as described in claim 1, which is characterized in that
If in the initial current traveling wave for reaching the relay at the transmission line of electricity both ends, preceding travelling wave current and anti-travelling wave current exist,
Then determine that the failure occurs in the protection line segment region between two relays, otherwise, it is determined that the failure occurs described
Except region.
6. one kind is based on morphologic overhead transmission line high impedance fault analysis system characterized by comprising
Initial current travelling wave analysis module, the initial current row generated for detecting transmission line of electricity because high impedance fault occurs
Wave handles the transient signal in the initial current traveling wave by Morphologic filters to obtain its effective feature volume, and accordingly
Determine that the initial current traveling wave reaches time and the polarity of the relay at the transmission line of electricity both ends；
Fault determination module, for reaching time and the pole of transmission line of electricity both ends relay according to the initial current traveling wave
Property, determine fault zone, fault type and the failure phase of the transmission line of electricity.
7. being based on morphologic overhead transmission line high impedance fault analysis system as claimed in claim 6, which is characterized in that
The Morphologic filters determine the polarity of the initial current traveling wave according to the variation slope of the transient signal, when described temporary
The variation slope of state signal is timing, and expanding signal is ahead of it and corrodes signal, when the variation slope of the transient signal is
When negative, expanding signal lags behind it and corrodes signal, and when the transient signal does not change, expanding signal corrodes letter with it
Number same-phase.
8. being based on morphologic overhead transmission line high impedance fault analysis system as claimed in claim 6, which is characterized in that
The initial current travelling wave signal that the relay at the transmission line of electricity both ends receives is converted to each modal components, institute by phase mould
State the fault type and failure phase for determining the transmission line of electricity in fault determination module by the analysis to each modal components.
9. being based on morphologic overhead transmission line high impedance fault analysis system as claimed in claim 8, which is characterized in that
Each modal components include MA0、MAα、MAβ、MAγAnd MB0、MBα、MBβ、MBγ, wherein MA0It indicates in one of relay just
0 mold component that beginning current traveling wave is converted to through phase mould, MAα、MAβ、MAγFor corresponding Aerial mode component, MB0For in another relay
0 mold component that initial current traveling wave is converted to through phase mould, MBα、MBβ、MBγFor corresponding Aerial mode component, if ia,、ib、icRespectively
The initial current signal of A, B, C three-phase of the transmission line of electricity, the impedance ground of the transmission line of electricity are 0 Ω, then expression matrix
Formula are as follows:
The boundary condition of generation A phase short circuit grounding failure is on the transmission line of electricityvaBelieve for the initial voltage of A phase
Number, then work as satisfactionWhen, determine that A phase short circuit grounding failure occurs on the transmission line of electricity；
The boundary condition of generation AB two-phase short-circuit fault is on the transmission line of electricityThen work as satisfactionWhen, determine that AB two-phase short-circuit fault occurs on the transmission line of electricity；
The boundary condition of generation ABG line to line fault ground fault is on the transmission line of electricityThen work as satisfactionWhen, determine that ABG line to line fault ground fault occurs on the transmission line of electricity.
10. being based on morphologic overhead transmission line high impedance fault analysis system as claimed in claim 6, feature exists
In if reaching in the initial current traveling wave of the relay at the transmission line of electricity both ends, preceding travelling wave current and anti-travelling wave current are deposited
Then the fault determination module determines that the failure occurs in the protection line segment region between two relays, otherwise, described
Fault determination module determines that the failure occurs except the region.
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| CN110018395A (en) * | 2019-04-24 | 2019-07-16 | 华中科技大学 | A kind of fault recognition method, system, device and the storage medium of HDVC route |
| CN110146788A (en) * | 2019-06-19 | 2019-08-20 | 上海鸿岩机械科技有限公司 | It is a kind of to utilize morphologic low-current line selection method |
| CN113311289A (en) * | 2021-05-13 | 2021-08-27 | 中煤科工开采研究院有限公司 | Multi-stage power supply system ground fault positioning method based on wide area current transient component |
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